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      1 /*
      2  * POWER Data Stream Control Register (DSCR) sysfs interface test
      3  *
      4  * This test updates to system wide DSCR default through the sysfs interface
      5  * and then verifies that all the CPU specific DSCR defaults are updated as
      6  * well verified from their sysfs interfaces.
      7  *
      8  * Copyright 2015, Anshuman Khandual, IBM Corporation.
      9  *
     10  * This program is free software; you can redistribute it and/or modify it
     11  * under the terms of the GNU General Public License version 2 as published
     12  * by the Free Software Foundation.
     13  */
     14 #include "dscr.h"
     15 
     16 static int check_cpu_dscr_default(char *file, unsigned long val)
     17 {
     18 	char buf[10];
     19 	int fd, rc;
     20 
     21 	fd = open(file, O_RDWR);
     22 	if (fd == -1) {
     23 		perror("open() failed");
     24 		return 1;
     25 	}
     26 
     27 	rc = read(fd, buf, sizeof(buf));
     28 	if (rc == -1) {
     29 		perror("read() failed");
     30 		return 1;
     31 	}
     32 	close(fd);
     33 
     34 	buf[rc] = '\0';
     35 	if (strtol(buf, NULL, 16) != val) {
     36 		printf("DSCR match failed: %ld (system) %ld (cpu)\n",
     37 					val, strtol(buf, NULL, 16));
     38 		return 1;
     39 	}
     40 	return 0;
     41 }
     42 
     43 static int check_all_cpu_dscr_defaults(unsigned long val)
     44 {
     45 	DIR *sysfs;
     46 	struct dirent *dp;
     47 	char file[LEN_MAX];
     48 
     49 	sysfs = opendir(CPU_PATH);
     50 	if (!sysfs) {
     51 		perror("opendir() failed");
     52 		return 1;
     53 	}
     54 
     55 	while ((dp = readdir(sysfs))) {
     56 		int len;
     57 
     58 		if (!(dp->d_type & DT_DIR))
     59 			continue;
     60 		if (!strcmp(dp->d_name, "cpuidle"))
     61 			continue;
     62 		if (!strstr(dp->d_name, "cpu"))
     63 			continue;
     64 
     65 		len = snprintf(file, LEN_MAX, "%s%s/dscr", CPU_PATH, dp->d_name);
     66 		if (len >= LEN_MAX)
     67 			continue;
     68 		if (access(file, F_OK))
     69 			continue;
     70 
     71 		if (check_cpu_dscr_default(file, val))
     72 			return 1;
     73 	}
     74 	closedir(sysfs);
     75 	return 0;
     76 }
     77 
     78 int dscr_sysfs(void)
     79 {
     80 	unsigned long orig_dscr_default;
     81 	int i, j;
     82 
     83 	orig_dscr_default = get_default_dscr();
     84 	for (i = 0; i < COUNT; i++) {
     85 		for (j = 0; j < DSCR_MAX; j++) {
     86 			set_default_dscr(j);
     87 			if (check_all_cpu_dscr_defaults(j))
     88 				goto fail;
     89 		}
     90 	}
     91 	set_default_dscr(orig_dscr_default);
     92 	return 0;
     93 fail:
     94 	set_default_dscr(orig_dscr_default);
     95 	return 1;
     96 }
     97 
     98 int main(int argc, char *argv[])
     99 {
    100 	return test_harness(dscr_sysfs, "dscr_sysfs_test");
    101 }
    102